Pressure gauge



J. W. PLACE.

PRESSURE GAUGE.

APPLICATION FILED MAR. 5, 1920.

Suva/whoa Patented Apr. 25, 1922.

UNITED STAT S- Joann w. PLACE,

"PAT N m ce.-

or onmcn, NEW JERSEY, AssIGNon r omen swarms entrain COMPANY, OF NEW YORK, N. Y., A CORPORATION OF PENNSYLVANIA.

rnnssimn GAUGE.

Patented Apr. 25, 1922.

Application filed March 5, 1920. Serial N 6. 363,392.

To allwhom it may concern: I

Be it known that I, JOSIAH W. PLACE, a. citizen of the United States of America, residing at Orange, Essex County, New Jersey, have invented a new and useful Pressure Gauge, of which the following is a specification. i

My invention relates particularly to a gauge of the Bourdon type, and has for its expensive means for retarding the actionof Y the tube after a certain part of the scale has been traversed by the pointer so as to make itpossible to indicate through a relatively small angular movement of thepointer considerable increases of pressure.

Briefly described, the inventlon maybe considered as contemplating the use of a' spring loosely connected between the mov-- able end of the Bourdonjube and the frame,

which spring is brought into play to eifec'-,

tively retard the movement of the tube after a certain range of movement which may .be'

deemed the normal range of the gauge.

Fig. 1 is a front view of'the gauge embodying the improvements of my invention. Fig. 2 is a front view with the casing broken away, and showing the interior mechanism.

Fig; 3 is a fragmentary detail showing the end of the tube, the stationary frame, and, the connecting spring'which is brought into .to the caslng. It is therefore possible to that the scale on the dial is divided uniformly' up to the number 10, and from there on the scale divisions indicating say five units of pressure are much closer together. r The tube 9 is of any suitable construction, and secured in any suitable manner to the base or support 11in the casing. -The spindle 6 carries a pinion-12 which meshes with a sector 13, whose slotted end-is conv nected by a link 14 to the movable end of the tube in the usual manner. The spring 15 is also provided as customary, to connect the shaft or spindle and the frame 16, which supports the spindle and the swinging sector. The action of the parts thus far described is the same as ordinarily found in devices" of thischaracter. 55 To retard the a tion of the tube while the main object the "provision of simple and in-' pointer is traversing the upper part of the scale say from division 10 to 30, I have provided a spring 17, which connects the free endof the tube 9 with the frame 16, and is I adapted to be brought into play only when the polnter reaches the scale division 10,

which may be considered thelupper end of the normal scale range of the gauge. The connect on betweenthe spring 17 and the frame is effected by a terminal member 18 whichis slidably supported in a lug 19 which pro ects upwardly from the frame. The other end of the spring is preferably con nected in a similar man'nerby a terminal 20 slidably mounted in a lug 21 which proiects from the movable end of the tube 9.

uring the normal range of movement of the parts, it will be'seen that the spring has 'no effect upon the tube,.but that when the free play between the terminal members 18 and 20 and the lugs 19 and 21 has been. taken up, the spring will come into play and retard the expansive action of the tube,

. so that thereafter. a given rise in pressure will produce a lemer angular movement of the pointer. i

It will be seen that the parts. are simple and inexpensive and readily applied to' an: .ordinary gauge, and that the construction is such-that the adjustment is inno wise effected by the relative position of'the casing, since-the spring is not connected at all construct and assemble the dependent of the casing.

I claim:

parts entirely in- 1. In a retard Bourdon gauge, a tube, a

pointer, multiplying mechanism connecting the movable end of the tube and the pointer, a frame for supporting said mechanism, and a spring connected at'its ends to said frame and tothe movable end of said tube, at least one of said connections permitting a relative limited "free movement so that said spring supporting said pointer, a spring having a slidingconnection with said frame and connected. to the movable end of said tube whereby said spring will retard the movement of said tube when the latter has moved a certain distance in an increased pressure registering direction.

3. In a retard Bourd'on gauge, a tube,. a frame, a sector suitably carried by said frame and connected to the movable end of said tube, a spring connected at one end of said frame and having a sliding connection with the movable end of said tube whereby the spring will have no efi'ect on said tube during the normal range of movement of the latter but will retard the movement of the tube after a pre-determined movement of said tube in an increased pressure registering direction.

4. In a retard Bourdon gauge, a tube, a frame, a sector carried thereby and connected to said tube, and a spring having a sliding connection with the movable end of said tube and a sliding connection with said frame whereby said tube will be unaffected by said spring during the normal range of. movement but will be retarded in its movc ment after a pre-determined movement of said tube in an increased pressure registering direction.

5. In a retard Bourdon gauge, a tube, a frame, a sector carried by said' frame and connected to the movable end of said tube, said frame and said tube having projecting lugs, and a spring having terminal pieces slidably mounted in said lugs whereby said spring will not affect the movement of said tube until a pre-determined pressure has been reached and the tube consequently moved a pre-determined distance.

' JOSIAH W. PLACE. 

